[exim] caching of file contents in expansion testing mode

Hello,

when debugging an expansion problem via -be I discovered the following
problem (running version 4.52 on FreeBSD):

If you're using a file lookup like

${if eq {${lookup{whatever}nwildlsearch{/some/file}}}{test}{yes}{no}}

the file contents are cached and will not be reread if /some/file has
been changed (-d always says 'cached open').

Is this a feature or a bug? If it is a feature (I don't guess so) it
should be documented in the docs.

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